Hundreds of students walked out of a teach-in about tolerance Wednesday at the University of California at San Diego, saying that it was not a sufficient response to racial tensions on the campus, the Los Angeles Times reported. The teach-in was organized by the university in the wake of a party that mocked black people who live in poor areas, and a student television show that defended the party and used an anti-black slur. Black students said these incidents were reflections of broader issues they face on a campus where they make up only 1.6 percent of the student body.